Rails - Jun 2006 - Getting an error on options_groups_from_collection_for_select

Hi,

I''m very new with Ruby and Rails.  I have read Agile Web Development 
with Rails and was trying to create a grouped selection list by 
following his example on page 359.

My helper looks like this:

module LoginHelper
  AssocOption = Struct.new(:code_name, :display_name)

  class AssocType
    attr_reader :type_name, :options

    def initialize(name)
      @type_name = name
      @options = []
    end

    def <<(option)
      @options << option
    end
  end

  none = AssocType.new("NONE")
  none << AssocOption.new("None", "None")
  none << AssocOption.new("All", "All")

  dr = AssocType.new("DOCTORS")
  dr << AssocOption.new("Dr. Dave", "Dave Smith")
  dr << AssocOption.new("Dr. Dan", "Daniel Jones")
  dr << AssocOption.new("Dr. Mike", "Michael
Smith-Jones")

  co = AssocType.new("COMPANIES")
  co << Assoc.Option.new("Company_1", "Company_1")
  co << Assoc.Option.new("Company_2", "Company_2") 


  ASSOCIATION_OPTIONS = [ none, dr, co ]
end

My View looks like this:

<select name="user[associationl]"
id="user_association">
<%option_groups_from_collection_for_select(ASSOCIATION_OPTIONS,
 :options, :type_name,
 :code_name, :display_name,
 @user.association)
%>
</select>


The error message I''m getting is this:

uninitialized constant ASSOCIATION_OPTIONS
Extracted source (around line #23):

20: -->
21: 	<select name="user[level]" id="user_level">
22: 	<%23: 	option_groups_from_collection_for_select(ASSOCIATION_OPTIONS,
24: 												 :options, :type_name,
25: 												 :code_name, :display_name,
26: 												 @user.level)


My question:  Didn''t I initialize ASSOCIATION_OPTIONS in the helper? 
What did I do wrong and how to I get the group select to work?  I tried 
to follow exactly what I read in the book, but it doesn''t seem to work,
so I''m assuming I did something wrong, I just can''t quite see
what it
is.

Any suggestions?

Thanks,

Dave